什么是“ - >”的名称，运算符在C ++？ [英] What is the name of the "-->" operator in C++?

问题描述

阅读 C ++ / STL的隐藏功能和暗角功能后， code> comp.lang.c ++。moderated ，我完全惊讶的是下面的代码片段在Visual Studio 2008和G ++ 4.4中编译和工作。

After reading Hidden Features and Dark Corners of C++/STL on comp.lang.c++.moderated, I was completely surprised that the following snippet compiled and worked in both Visual Studio 2008 and G++ 4.4.

这里是代码：

#include <stdio.h>
int main()
{
    int x = 10;
    while (x --> 0) // x goes to 0
    {
        printf("%d ", x);
    }
}

我假设这是C，在GCC以及。

I'd assume this is C, since it works in GCC as well. Where is this defined in the standard, and where has it come from?

推荐答案

- > 不是运算符。它实际上是两个单独的运算符， - 和> 。

--> is not an operator. It is in fact two separate operators, -- and >.

条件代码递减 x ，同时返回 x 的原始（非递减）值，然后使用> 运算符将原始值与 0 进行比较。

The conditional's code decrements x, while returning x's original (not decremented) value, and then compares the original value with 0 using the > operator.

为了更好地理解，语句可以写成：

while( (x--) > 0 )

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